1) Both are great lines.
2) Stereophile published their measurements of the D7
3) I think Ryan tweeters are less likely to be bright in near field, although may be total non-issue with Spendors. I have heard only the D9 as well as all Ryans a number of times. The HF is much easier to "treat" than the lows post purchase of course.
4) I would call Ryan and ask what model is most appropriate for your room setup. It may be the R620, which actually has a more similar configuration to the D7 than the R630, or even the R610 with sub. Overloading bass can bring down the whole deal and cap your listening level.